Method for producing a filter feeder, device suitable for carrying out the method, and filter feeder

ABSTRACT

In a method of manufacturing a filter feeder intended for insertion into a casting mold used for casting metals, the filter feeder has a feeder body comprising an inner feeder volume, consisting of an exothermic and/or insulating material, with a lateral wall region and with a bottom region comprising a feeder opening for connecting the feeder volume to a casting cavity. A filter element is fixed in the feeder body of the filter feeder. The invention also concerns a device suitable for carrying out the process.

The invention relates to a method for producing filter feeder intended to be inserted into a mold used in the casting of metals, wherein the filter body has a first, inner feeder volume and consists of an exothermic and/or insulating material, the feeder body having a lateral wall region and a bottom region that has a feeder opening for connecting the feeder volume to a casting cavity, and wherein a filter element is secured in the feeder body of the filter feeder.

The invention also relates to a device suitable for performing the method as well as a filter feeder.

The structure of a filter feeder to be manufactured using the invention is described in DE 20 2016 103 430 U1. If a filter feeder has to be handled during transport and/or preparation of the casting mold, for example if it is turned, there is a risk that the filter element, which, for reasons based on materials, already forms a separate component, will become detached from the feeder body during handling. In order to prevent this, DE 20 2016 103 430 U1 proposes to clamp the filter element by means of a paper sleeve in a receptacle designed to receive it on the feeder body.

In this respect, the disadvantage of this known solution is that not only a separate aid must be provided with the paper sleeve, but also that a separate step is required for the assembly of the finished filter feeder. This involves correspondingly high manufacturing costs.

The invention is therefore based on the object of simplifying the process of producing a filter feeder and also of providing a device suitable for carrying out a corresponding method.

The solution for this object is provided in advantageous embodiments of the invention which are the subject of the patent claims and which are described in this specification.

The basic idea of the invention is that, during the production of the filter feeder in a core shooting machine, the filter element is positioned on a king that projects into a mold cavity defining the shape of the feeder body in a shooting mold of the core shooting machine and forms the feeder volume of the finished filter feeder in such a way that, during the shooting of the filter feeder, the filter element is surrounded by the shot-in material and anchored in the material of the finished filter feeder during the shooting of the filter feeder.

In this respect, the invention has the advantage that the filter element is shot in during the production of the feeder body in a single process step, so that the filter element is firmly fixed to the feeder body from the start and no longer has to be fixed by means of a separate aid and in a separate operation.

A first example of the invention is the manufacture of a filter feeder, in which the filter element forms a cover opposite the bottom area of the feeder body. A filter feeder of this design results from the mentioned DE 20 2016 103 430 U1. To produce such a filter feeder, it is necessary that the filter element is placed on an upper end face of the king projecting into the mold cavity and fixed to it, and a shooting plate closing the mold cavity in the shooting mold holds the filter element against the king during the shooting of the material.

An alternative example of the invention is the design of a filter feeder in which the filter element forms the bottom area of the feeder body and at the same time also represents the feeder opening. Such a design is not known in the state of the art, so that this special design is also an object of invention in itself, especially in connection with a process suitable for its manufacture. This method provides for the filter element to be placed on a positioning plate fixed to a base plate, which defines the base area of the feeder body. The king is then placed with an end face on the inserted filter element, and the material is shot into the remaining mold cavity of the firing mold.

A device suitable for carrying out the manufacturing processes for the production of different filter feeder molds contemplates, in particular, a shooting mold forming part of a core shooting machine with a mold cavity formed therein that receives a king. At least two radially projecting ribs are arranged on the outside of the king and distributed over its outer circumference, the ribs projecting beyond the end face of the king that contacts the filter element and thereby at least partially outwardly surrounding the filter element positioned on the king and fixing it during the shooting of the material into the mold cavity of the closing mold. The remaining areas of the mold cavity which are not filled by the ribs surrounding the filter element on the outside are filled by the shot-in material during the shooting process, so that the shot-in material on the one hand forms the lateral wall area of the finished feeder body, but on the other hand also surrounds the filter element on its outside and thereby fixes it to the feeder body as a component of the lateral wall area.

In this connection, the ribs may have a crescent-shaped contour with an external curvature.

It can be useful if four ribs are arranged on the circumference of the king.

As far as the device being intended to carry out a manufacturing process for a filter feeder with a filter element forming a cover, it may be provided that the king is a component of a base plate of the shooting form which defines the bottom area of the feeder body.

As far as the manufacture of a filter feeder with a filter element forming its bottom area is concerned, the device can provide that on a base plate of the shooting mold, which defines the bottom area of the feeder body, a positioning plate is arranged which surrounds the filter element inserted into the mold cavity with an edge projecting up on its outer circumference.

Here it may be provided, in particular, that the king which can be inserted onto the filter element placed on the positioning plate is fixed to a shooting plate which closes the mold cavity of the shooting mold on the outside.

Alternatively, it may be provided that the king attachable to the filter element placed on the positioning plate is attached to a holding plate externally overlapping the mold cavity of the firing mold.

However, according to another example of the invention, it is also conceivable that the king that can be attached to the filter element placed on the positioning plate is a loose component fixed by a shooting plate or a holding plate placed on the outside of the mold cavity of the shooting mold.

The invention also relates to a filter feeder with a feeder body consisting of an exothermic and/or insulating material and having an inner feeder volume, the feeder body having a lateral wall lining.

A filter element is fixed in the feeder body of the filter feeder, wherein the filter element is at least partially embedded on its outer circumference in the material of the feeder body and is thereby directly anchored in the material of the finished filter feeder.

In particular, it is provided here that at least one rib is formed on the inside of the lateral wall region facing the feeder volume, projecting into the feeder volume, the rib bearing against the outer periphery of the filter element at the end face and clamping and fixing the filter element.

In alternative versions of the invention, it may be provided that the filter element is arranged in the upper region of the feeder body opposite the bottom region of the feeder body, or that the filter element is arranged in the bottom region of the feeder body.

In the drawings, embodiments of the invention are provided, which will be described below. In the drawings:

FIG. 1 shows a shooting mold of a core shooter equipped for the production of a filter feeder with a mold cavity, a king, and a filter element before the start of the shooting process;

FIG. 2 shows a filter feeder finished with a shooting mold according to FIG. 1 in a sectional view;

FIG. 3 shows the filter feeder according to FIG. 2 in a view of its bottom region;

FIG. 4 shows an alternative embodiment of a shooting mold in a representation according to FIG. 1 for producing a filter feeder with a filter element forming its bottom region;

FIG. 5 shows an alternative embodiment for producing a filter feeder with a filter element forming its bottom region; and

FIG. 6 shows the filter feeder produced with a shooting mold according to FIG. 4 or FIG. 5 in a sectional view.

The finished feeder body 11 of a filter feeder 10, which can be seen in detail in FIGS. 2 and 3, comprises a lateral wall region 13 enclosing a so-called feeder volume 12 in the form of an inner cavity and a lower bottom region 14 in which a feeder opening 15 is formed. This feeder opening 15 serves in the usual way to connect the feeder volume 12 with the casting cavity of a casting mold, which is not shown here, with which the filter feeder is to be used.

The feeder body 11 shot in a core shooter (not shown) has a filter element 16 that is shot in opposite to its bottom area 14 and thereby fixed in a manufacturing process.

Insofar as the production of the filter feeder 10 as described above is carried out in a known manner by shooting in a core shooting machine, the shape of the feeder body 11 is formed by a mold cavity 20 formed in a shooting mold 17 and a king 21 projecting into the mold cavity 20. Basically, such a mold 17 comprises a base plate 18 and a cylindrical outer casing 19, which encloses the inner mold cavity 20. In the example shown in FIG. 1, a king 21 is attached to the base plate 18 and projects into the mold cavity 20. If the part of the mold cavity 20 that is not filled by the king 21 is filled with the injected material during the shooting process, the correspondingly formed annular space defines the shape of the feeder body 11, in particular, the lateral wall area 13. At the same time, the king 21 forms the feeder volume 12 predetermined by an inner cavity that is formed as a result.

As is known to the practitioner with regard to such shooting molds 17, the mold cavity 20 is closed on its upper side opposite the base plate 18 by means of an upper box or a shooting plate of the core shooter. For reasons of simplification, this arrangement is not further shown in FIG. 1, but is reproduced in FIG. 4.

As a filter element 16 is to be shot into the feeder body 11 in a manufacturing process with the shooting mold 17 shown in FIG. 1, the king 21 is provided with ribs 22 arranged at a distance from one another on its outer circumference, which extend beyond the upper end face of the king 21 opposite the base plate 18 with projections 23, specifically, over a partial region of the material thickness of the filter element 16 to be shot in. During preparation for the manufacturing process, the filter element 16 is thus placed on the respective upper end face of the king 21 and is thereby fixed by the projections 23 of the ribs 22. As the projections 23 extend only over a partial area of the material thickness of the filter element 16, a partial area 24 of the material thickness of the filter element 16 remains free, so that the material shot into the remaining area of the mold cavity 20 that is not filled by king 21 and the filter element 16 surrounds and fixes the filter element 16 in the form of a correspondingly formed rib 40.

As not shown further, the mold cavity 20 above the filter element 16 is closed by a shooting plate (not shown), which simultaneously holds the filter element 16 against the filter element 16 during the shooting process and thereby prevents movement of the filter element 16.

After demolding the finished filter feeder 10 from the shooting mold 17, the filter feeder 10 has the shape shown in FIGS. 2 and 3. The crescent-shaped depressions 25 of the ribs located on the king 21 can be seen on the inner surfaces of the lateral wall area 13, as can the rib 40 fixing the filter element 16.

In the example shown in FIGS. 4 and 5, the filter element 16 must be arranged in the bottom area 14 of the feeder body 11. For this purpose, a fixed positioning plate 26 is provided on the base pate 18 of the shooting mold 17. The fixed positioning plate 26 has on its outer circumference—at least partially—an upstanding edge, so that for the preparation of the shooting process, the filter element 16 is placed on the positioning plate 26 and is thereby positioned by the edge 27. Next, the king 21 with the projection 23 of the ribs 22 is placed on the filter element 16, whereby a free partial area 24 remains again between the upstanding edge 27 and the end of the projection 23 of the ribs 22, the partial area 24 being filled by the shot-in material during the shooting process. In this respect, the filter element 16 is also fixed to the feeder body 11 after demolding, as can be seen from FIG. 6, which shows a finished filter feeder 10 in a shooting mold 17 produced in accordance with FIG. 4 or FIG. 5.

As shown in the example in FIG. 4, the king 21 is closed by means of a shooting plate 31, consisting of two plates and placed on the shooting mold 17 of the core shooter (not shown further), in which shooting funnels 32 are formed in the usual manner. The king 21 is attached to the upper of the two individual plates forming the shooting plate 31 by means of a fastening device 33, so that when the shooting plate 31 is placed on it, the king 21 encloses and fixes the filter element 16 inserted in the positioning plate 26.

Alternatively, it can be provided in accordance with FIG. 5 that a web-like holding plate 34 spanning the open side of the shooting mold 17 opposite the base plate 18 is arranged in the mold cavity 20 for holding the king 21, to which the king 21 is in turn fastened by means of fastening device 33. A shooting plate, not shown here, is then placed on this holding plate 34 in the usual manner.

Finally, it is also contemplated that the king 21 is designed as a loose or separately manageable component which, after the insertion of the filter element 16, is inserted into the positioning plate 26 and subsequently fixed in a suitable manner in the mold cavity 20 of the shooting mold 17, for example by means of the shooting plate 31, a holding plate 34, or a holding device designed in another manner on an upper box of the shooting mold.

The features of the subject matter of these documents disclosed in the above description, the patent claims, the summary and the drawing may be essential, individually or in any combination, for the realization of the invention in its various forms. 

1-15: (canceled)
 16. A method of manufacturing a filter feeder (10) in a core shooter for insertion into a mold used in the casting of metals, the filter feeder (10) having a feeder body (11) with an inner feeder volume (12) and comprising an exothermic and/or insulating material, the feeder body (11) having a lateral wall region (13) and a bottom region (14) having a riser opening (15) for connecting the riser volume (12) to a mold cavity, and wherein a filter element (16) is fixed in the feeder body (11) of the filter feeder (10), comprising: positioning the filter element (16) on a king (21) that projects into a mold cavity (20) and provides the shape of the feeder body (11) in a shooting mold (17) of the core shooting machine and forms the feeder volume (12) of a finished filter feeder (10), the filter element (16) being positioned on the king (21) in such a way that the filter element (16) is surrounded by shot-in material during shooting of the filter feeder (10) and is anchored in material of the finished filter feeder (10).
 17. The method according to claim 16, further comprising: positioning the filter element (16) on an upper end face of the king (21) and fixing the filter element (16) to the upper end face, wherein the filter element (16) forms a cover opposite the bottom region (14) of the feeder body (11), and a wherein mold plate closing the mold cavity (20) in the shooting mold (17) holds the filter element (16) against the king (21) during shooting of the material.
 18. The method according to claim 16, wherein, to produce a filter feeder (10) with a filter element (16) forming the bottom region (14) of the feeder body (11), the filter element (16) is placed on a positioning disc (26) fixed to a base plate (18), the base plate (18) predetermining the bottom region (14) of the feeder body (11), wherein the king (21) is fitted with an end face onto the filter element (16) and the material is shot into remaining space of the mold cavity (20) of the shooting mold (17).
 19. A device for performing the method according to claim 16, comprising: a shooting mold (17) forming a component of a core shooting machine with a mold cavity (20) formed therein and being configured to receive a king (21), the king (21) having an end face that contacts a filter element positioned in the mold cavity (20); at least two radially projecting ribs (22) arranged on the outside of the king (21) and distributed over an outer circumference of the king (21), the ribs (22) projecting beyond the end face of the king (21) and at least partially externally surrounding the filter element (16) positioned on the king (21) and fixing the filter element (16) in the mold cavity (20) of the shooting mold (17) during the shooting of casting material.
 20. The device according to claim 19, wherein the ribs (22) have a crescent-shaped contour with an external curvature.
 21. The device according to claim 19, comprising four ribs (22) arranged on the circumference of the king (21).
 22. The device according to claim 19, wherein the king (21) is a component of a base plate (18) of the shooting mold (17), wherein the base pate (18) defines a bottom region (14) of a feeder body (11).
 23. The device according to claim 19, further comprising a positioning plate (26) enclosing the filter element (16) and having an edge (27) projecting from an outer circumference, the positioning plate (26) being arranged on a base plate (18) of the shooting mold (17), wherein the base plate defines the bottom region (14) of a feeder body (11).
 24. The device according to claim 23, wherein the king (21) is configured to be fitted onto a filter element (16) placed on the positioning plate (26), and wherein the king (21) is fastened to a shooting plate (31) externally closing the mold cavity (20) of the shooting mold (17).
 25. The device according to claim 23, wherein the king (21) is configured to be fitted onto a filter element (16) placed on the positioning plate (26) and is fastened to a holding plate (34) engaging externally over the mold cavity (20) of the shooting mold (17).
 26. The device according to claim 23, wherein the king (21) is configured to be fitted onto the filter element (16) placed on the positioning plate (26) and is a loose component that is fixed by a shooting plate (31) that externally closes the mold cavity (20) of the shooting mold (17) on the outside or is a holding plate (34) placed to cover the mold cavity (20).
 27. A filter feeder (10), comprising: a feeder body (11) having an inner feeder volume (12) and comprising an exothermic and/or insulating material, the feeder body (11) having a lateral wall region (13) and a bottom region (14) with a feeder opening (15) for connecting the feeder volume (12) to a mold cavity, wherein a filter element (16) is fixed in the feeder body (11) of the filter feeder (10), the filter element (16) being at least partially embedded on an outer circumference in the material of the feeder body (11) and is thereby directly anchored in the material of finished filter feeder (10) in a finished state.
 28. The filter feeder according to claim 27, further comprising at least one rib (40) formed on the inside of the lateral wall region (13) facing the feeder volume (12), said rib projecting into the feeder volume (12), said rib (40) bearing against the outer circumference of the filter element (16) at the end face and clamping and fixing the filter element.
 29. The filter feeder according to claim 27, wherein the filter element (16) is arranged in an upper region of the feeder body (11) opposite the bottom region (14) of the feeder body (11).
 30. The filter feeder according to claim 27, wherein the filter element (16) is arranged in the bottom region (14) of the feeder body (11). 